In our 10.2 prod environment, I want to find out whether 11 rows was updated or not on yesterday between 2pm to 3pm. I know the table anme and have got the rows id's of interest. dont know audit is enabled or not, or its a only solution or there is some SQL to track it. I will appreciate your input(s).

your AUDIT_TRAIL= NONE so your audit is disabled. but u can use LogMiner Operational Information in Views all history data.
please check below link for LogMine details
I think your only option will be log miner:
http://docs.oracle.com/cd/B19306_01/server.102/b14215/logminer.htm#i1009063

>
In our 10.2 prod environment, I want to find out whether 11 rows was updated or not on yesterday between 2pm to 3pm. I know the table anme and have got the rows id's of interest. dont know audit is enabled or not, or its a only solution or there is some SQL to track it. I will appreciate your input(s).
>
Try using a flashback query and create a new table with the data. Then compare the records in the current table with those from yesterday.